Dynamo-electric machine.



J. GEISSLINGER.

DYNAMO ELECTRIC MACHINE.

APPLICATION FILED JUNE 17. 1913.

1,210,639. Patented Jan. 2, 1917. F59?! i1 3 3 mini-um WITNESS? M 7 Er g p y W UNITED STATES PATENT orrrcE.

JOHANN GEISSLINGER, OF GENEVA, SWITZERLAND, ASSIGNOR, BY DIRECT AND MESNE' ASSIGNMENTS, OF ONE-HALF TO FABRIQUE INTERNATIONALE, DAPPAREILS A MAGNETO S. A. (F. I. A. MI), GENEVA-ACACIAS, SWITZERLAND, AND ONE-HALF TO MARBURG BROTHERS, OF NEW YORK, N. Y., A CORPORATION.

DYNAMIC-ELECTRIC MACHINE.

Specification of Letters Patent.

Patented Jan. 2, 1917.

Application filed June 17, 1913. Serial No. 774,153.

Confederation of Switzerland, have invented certain new and useful Improvements in Dynamo-Electric Machines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it apppertain to make and use the same.

The present invention relates to dynamo electric machines, and particularly to a type of magneto electric generator well adapted for lighting electric lamps, wherein the generator is of simple and sturdy construction, is reliable in operation with but little attention, and is provided with a novel form of suspension for supporting it in frictional driving engagement with the tire of a motorcycle or the like, the arrangement being such that the generator may be readily disassembled at will for inspection and repair. A magneto electric generator of this general type isishown in my co-pending application, Serial No. 699,099, filed May 23, 1912, but the generator of this application embodies several improvements thereon relating especially to the bearing for overhang ing the armature within themagnet and between the poles thereof, to the means for maintaining a. substantially constant terminal voltage irrespective of the driving speed, andto' a bracket support such that the vibration of the generator is reduced to a minimum even when the driving wheel does not run true'in its rotation.

In the accompanying drawing, illustrat ing my invention in application to a motorcycle, as an example, Figure 1 represents a vertical elevation of the generator supported from the frame of the cycle in frictional v driving engagement with the tire; Fig. 2

represents an elevational section at. rightangles to Fig. 1; Fig. 3 represents an enlarged View particularly showing a part of the bearing for overhanging'the armature, and Figs. 4 and 5i-represent enlarged views of "the unsupported end of the armature, particularly showing the electrical'connections of the-armature winding.

The generator is-of the magneto type having a permanent field magnet 1, with a cylindrical-shaped inner face having its axis of curvature along the length of the arms of the magnet. The outer face of the magnet is similarly curved but has flat surfaces adjacent the open spaces between, the arms.

The overhanging bearing member is of non-magnetic metal and has a circular flange 2 closely fitting within the inner surface of the magnet arms, While the end of the bearing member abuts against the eifds of the magnet arms to form an end closure for the magnet, as is best shown in Fig. 3, This bearing member has an extended tubular portion 3 and is provided with ball bearings 4 separated as far as possible from each other along the armature shaft 5. The bearing member is supported from the magnet by the plates 6 of non-magnetic metal, which are seated on the fiat outer surfaces of the magnet and are fastened to the transverse support 7 by the screws 8 and to the bearing by the screws 9, the transverse support being fastened to the magnet by the a circumferential ledge 12' at their ends adjacent the bearing, and the cap 13 of nonmagnetic metal is provided with a cooperating circumferential offset 14 adapted to fit the eldge to th areby center the ca relatively to the axis of the armature.

ture shaft 5 is fastened to the center of the cap and extends through the bearing," the arrangement beingsuch that the armature is overhung within the magnet in centered position between the poles thereof, while. the bearing is rigidly supported from the magnet by the side plates 6. The insulating ee Figs. 2 and 3). The cap is held in position on the" armature'core by the screws 15. The arma member 16 is-s'upported on the unsupported end of the armature by two posts 17 of elec tric'al conducting material, and fastened tothe ends'of the pole pieces 11. (See Figs. 4 and 5). The terminal 18 of the armature 'winding is connected to one of the posts 17 and is'therefore grounded on the armature core, whilethe other terminal of the armamined speed of rotation of the armature, and

thereby short circuits the portion of the armature winding connected between the intermediate terminal and that terminal which is connected to the button 20. At higher speeds the button 23 wipes on the strip 22 and keeps a bright surface of contact between them. As the driving speed of the armature increases, the voltage generated by the winding increases, but at the same time the inductance increases at the same rate. The terminal voltage of the magneto would be maintained at a substantially constant value without any regulating expedient/at all, if the electric lamp or other translating device supplied with current by the generator were purely inductive in character. However, since an incandescent lamp has practically no inductance, the impedance of the circuit of the magneto does not rise at of the magneto.

providlng the bearing pin 28 of the bracket 1 the same rate as the driving speed. Thus when the terminal voltage of the magneto reaches a predetermined high value, the centrifugal switch 21, 22 is designed to close so as to short circuit a part of the generator winding and also so as to weaken the field as a result of the reaction of the ampereturns in the short circuited part of the armature winding, thereby reducing the terminal voltage of the magnet to a sufliciently low value as will not in practical operation be increased by further rising speed to any excessive value. It has been found in practice that this arrangement is well suited for lighting lamps on motor-cycles and like vehicles in this way. The brush 24 is arranged in sliding engagement with the button 20, and the conductor 25 leads the current produced in the armature windingto the outslde, for example to an incandescent lamp to be lighted.

The magneto is supported from the frame of the cycle in such manner that the friction roller 26, which is mounted on the outer end of the armature shaft 5, is maintained continually 1n driving engagement with the tire of the wheel 27 without material vibration This result is attained by clamp 29 substantially parallel to the plane of rotation of the driving wheel, but substantlally at right-angles to the radius thereof, and also by supporting the magneto on this bearing pin ina plane which passes substantially through the center of gravity of the magneto. Thus when the wheel--27 does not run true in its rotation, thei'hagneto oscillates through but a small angle, while the moments on the two sides of the bearing pin are substantially equal, thus reducing the angle through which the magneto oscillates and the inertia effects to small values. The bearings for the bearing pin. 28 is formed in the two flanges 30 on one of the side plates 6 near the center of the magnet arms. The spring 31 is wound around the bearing pin 28-with its outer ends pressing against the side plate 6 and its center held by one end of the member 32 which is fastened by the screw 33 to the bearing pin. The other end of the member 32 carrles an adjustable-thumb screw 34 and a locking member 35 therefor, the arrangement being such that while the bearing pin is held rigidly in position by the clamp 29, the magneto is allowed to be turned by the spring 31 only through the angle at which the end of the adjustable screw 34 comes into contact with the side plate 6'. In the other direction of oscillation, the wheel 27 turns the magneto on the bearing pin against the stress of the spring. It has been found in practical operation that the magneto swings but through a small angle and but with little vibration.

The magneto may be readily disassembled for inspection and repair, simply by removing'the screws 8 and then pulling the magnet 1 away from the bearing and the plate 6, the armature and its connections then being exposed. The manner of taking-- the remaining equipment apart will be apparent from the drawings and foregoing description.

When it is desired to hold the friction roller 26 out of driving engagement with the tire, as, for instance, during the day time when the use of the 'lamp is not. re-

quired, the adjustable set screw 34 may be glven the requisite number of turns to swing the friction roller 26 clear of the tire, whereuponit will beheld out of driving engagement therewith.

Havin thus described my invention, what I 5 im is:

1. In a magneto electric generator, a permanent field magnet of the horse-shoe type, a rotatable armature having its axis positioned along the length of the magnet arms, an armature shaft extending in a single direction from the armature, an extended bearing member for the shaft abutting the outer. endsof the magnet arms and being provided with ball bearings which/ are widely separated along the armature [shaft so as to rigidly overhang the armature within the magnet between the poles thereof, means for supporting the bearing member from the magnet, and means on the outer end of the armature shaft whereby the armature may be rotated; substantially as described.

2. In a magneto electric'generator, a ,permanent field magnet of the horse-shoe type, a rotatable shuttle-wound armature, a cap fastened to the armature core and being internallyrecessed to provide for the entrance "thereinto of the ends of the armature coil,

an armature shaft fastened to the cap, a bearing member for the shaft attached to the magnet so as to positionthe armature within the magnet between the poles thereof, and means on the shaft whereby the armature may be rotated; substantially as described.

3. In a magneto electric generator, a permanent field magnet of the horse shoe type, a rotatable shuttle-wound armature having a circular ledge on the ends of the pole pieces, a cap having a circumferential offset cooperative with said ledge and being internally recessed to provide for the entrance thereinto of the ends of the armature coils, an armature shaft fastened to the cap, a bearing member for the shaft attached to the magnet so as to position the armature within the magnet between the poles thereof, and means on the shaft whereby the armature may be rotated; substantially as described;

4. In a magneto electric generator, a permanent field magnet of the horse-shoe type, a rotatable shuttle-wound armature, a bearing member which is attached to the magnet and which entirely supports the armature in overhung position between the poles of the magnet, an insulating member located at the unsupported end of the armature and fastened to the pole pieces thereof, a conducting button carried by the insulating member, a stationary brush in sliding engagement with the button, and

' means whereby the armature may be rotated, one terminal of the armature winding being grounded, and the other terminal of the armature winding being electrically connected to the conducting button to connect the armature winding to the outside; substantially as described.

5. In a magneto electric generator, a permanent field magnet of the horse-shoe type, a rotatable shuttle-wound armature, a bearing member which is attached to the mag net and which entirely supports the armature in overhung position betweenthe poles of the magnet, an insulating member-41ocated at the unsupported end of the armature, a conducting support for fastening the insulating member to the pole pieces of the armature, a conducting button carried by the insulating member, a stationary brush in sliding engagement with the button, and means whereby the armature may be rotated, one terminal of the armature winding being electrically connected to the con ducting support and therethrough ,to the armature core to ground the armature winding, and the other terminal of the armature winding being electrically connected to the conducting button to connect the armature winding to the outside, sub stantially as described.

6. In a magneto electric generator, a permanent field magnet of the horse-shoe type, a rotatable shuttle-wound armature, a bearing member which is attached to the magnet and which entirely supports the armature in overhung position between the poles of the magnet, an insulating member located at the unsupported end of the armature and fastened to the pole pieces thereof,-a conducting button carried by the insulating member, a stationary brush in sliding engagement with the button, and means Whereby the armature may be rotated, one terminal of the armature winding being grounded, the other terminal of the armature winding being electrically connected to the conducting button to connect the armature winding to the outside, and an intermediate point of the armature winding being electrically connected to the conducting button through a switch; substantially as described.

7. In a magneto electric generator, a permanent field magnet of the horse-shoe type, a rotatable shuttle wound armature, a bearing member which is attached to the magnet and which entirely supports the armature 100 in overhung position between the poles of the magnet, an insulating member located at the unsupported end of the armature, a conducting support fastening the insulating member to the pole pieces of the armature, 105 a conducting button carried by the insulating member, a stationary brush in sliding engagement with the button, and means whereby the armature may be rotated, one terminal of the armature windin being 110 electrically connected to the conducting support and 'therethrough to the armature core to ground the armature winding thereon, the other terminal of the armature winding being electrically connected to the conducting button to connect the armature-winding to the outside, and an intermediate point of the armature windin being electrically connected to the conducting button through a switch; substantially as described.

8. The combination with a cycle wheel, of a generator adapted to be driven thereby and comprising a field magnet of the horse shoe type, an armature supported between the poles thereof and having driving means engageable with the wheel, a plate orming a closure for the space between the arms of the magnet and having bearings, a bracket adapted to be attached to a stationary part of the cycle and having a bearing pin sup- .the magnet and having bearings, a bracket adapted to be attached to a stationary part [snan] Signed and sealed this 6th da of February, A. 1).,

of the cycle and having a bearing pin supported in said bearings, a member fastened to the bearing pin, a spring acting between ing pin against the stress of the spring to hold the driving means on the armature shaft out of engagement with the wheel.

In testimony whereof I aflix my signature. J OHANN GEISSLINGEB.

R. F. WHITEHEAD, Acting Commissioner qfPatentc.

l It is hereby certified that in Letters Patent No. 1,210,639, granted January 2, 1917, upon the application of Jo'hann Geisslinger, of Geneva, Switzerland, for-an improvement in Dynamo-Electric Machines, an error appears in the printed specification requiring correction as follows: Page 1, line 86, for the word eldge read ledge; and that the said Letters Patent should be read with this correc tion therein that the same mayconforin to the record of the case in the Patent Ofiice. 

